| Penarth to Octeville | 141.48 mi (227.69 km) |
| Penarth to Oignies | 276.29 mi (444.65 km) |
| Penarth to Oissel | 236.70 mi (380.94 km) |
| Penarth to Olivet | 334.76 mi (538.74 km) |
| Penarth to Ollioules | 710.72 mi (1,143.80 km) |
| Penarth to Olonne-sur-Mer | 344.00 mi (553.62 km) |
| Penarth to Oloron-Sainte-Marie | 581.47 mi (935.79 km) |
| Penarth to Onet Village | 555.94 mi (894.71 km) |
| Penarth to Onnaing | 303.41 mi (488.29 km) |
| Penarth to Orange | 624.56 mi (1,005.14 km) |
| Penarth to Orchies | 286.78 mi (461.53 km) |
| Penarth to Orleans | 333.00 mi (535.91 km) |
| Penarth to Orly | 308.50 mi (496.49 km) |
| Penarth to Ormesson-sur-Marne | 311.88 mi (501.92 km) |
| Penarth to Orsay | 303.34 mi (488.17 km) |
